A few SDN-shown pools however have an “operator” authorization. Of these, two belong to pretty previous, now-unused variations of Tornado Cash. The remaining swimming pools either have more recent, immutable variations, or were applied so tiny they were probably ignored in the course of the May 2020 last update. This https://fluidalab.com/how-tornado-cash-enhances-privacy-for-ethereum-and-bnb-transactions/